Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Working Vessels => Topic started by: npomeroy on May 20, 2023, 10:06:46 pm

Title: Tugboat deck profile: flat or cambered?
Post by: npomeroy on May 20, 2023, 10:06:46 pm

I'm drafting the parts for a Damen 1907, working from the GA drawing on the PDF brochure and photos. Not being familiar with full-sized boats, I'm wondering if the main deck is flat or cambered? (I know there is fore-aft curve). The drawings on close inspection suggest the deck is higher in the middle which would make sense for shedding water through the scuppers. I've already drafted most of the hull ribs for ply laser cutting, and it will be hard to get a compound curve from a single sheet of 1mm ply as I was intending.


Cheers
Nelson

Title: Re: Tugboat deck profile: flat or cambered?
Post by: steve mahoney on May 21, 2023, 10:01:30 pm

If there is much shear on the deck then any camber will be a very complex curve if you make the deck in one piece. What size is it?

Title: Re: Tugboat deck profile: flat or cambered?
Post by: npomeroy on May 21, 2023, 10:22:30 pm

Hi Steve
The deck is 600 x 240 mm. There is quite a fore-aft curve so yes it would be a compound curve. I'm thinking I would need to make it up in several strips maybe 30 mm wide, using 0.5 mm ply and do it double-thickness with the strips alternately overlapping.


N

Title: Re: Tugboat deck profile: flat or cambered?
Post by: steve mahoney on May 21, 2023, 11:10:43 pm

Yeah, that would work. Maybe 0.8mm as the 0.5mm is very thin. Even double thickness is quite light and may not be tough enough for a deck.
30mm strips of 1 or 1.2mm would do it as well. Make the joins welding seams.

Title: Re: Tugboat deck profile: flat or cambered?
Post by: npomeroy on May 22, 2023, 01:05:44 am

I've got plenty of 1.0 mm, so doubling that sounds fine.

Title: Re: Tugboat deck profile: flat or cambered?
Post by: steve mahoney on May 22, 2023, 09:25:14 pm

Don't forget start a build log on the forum.

Title: Re: Tugboat deck profile: flat or cambered?
Post by: nemesis on May 24, 2023, 12:12:37 pm

Hi, The deck is laid in plates, why not give that a try. Bend the plate to match the camber, nemesis

Title: Re: Tugboat deck profile: flat or cambered?
Post by: npomeroy on May 25, 2023, 10:49:45 am

Quote from: nemesis on May 24, 2023, 12:12:37 pm

Hi, The deck is laid in plates, why not give that a try. Bend the plate to match the camber, nemesis

Thanks for that suggestion. I'd need a lot of framework for attaching them though. I'm not expecting to show detailed weld lines as Steve suggested, so a series of overlapping very wide planks (2 x 1mm thick) should do the trick. There will be a big hatch in the rear deck area to provide access to the internals (see my post on waterproofing), and I may also attach the cabin over a "hole" so there will not be large uninterrupted sweeps of deck surface.


Cheers
Nelson